Why it takes too long to make simple cuts in blender VSE?
When "rendering" a video from the VSE, blender essentially plays all of the source videos frame by frame that will be used to make up the current frame, it then merges each video frame with any effect strips to get the final image for the frame and sends that final frame to ffmpeg to be compressed using the encoding options. These steps will always be performed even if only one unaltered video stream is in the VSE and you want it saved using the same compression settings as the original video.

If you only want to cut a part of a video and keep the same video compression settings, you will find other software better suited. The ffmpeg cli command is one fast option, when you specify that the video and audio is to be copied, it will not decode/encode the video which makes it almost as fast as just copying the file. -c:v copy will copy the video track and -c:a copy does the same for audio with -ss 00:10:00 specifying the start time and -t 00:36:25 being the duration.

ffmpeg -i source.mp4 -c:v copy -c:a copy -ss 00:10:00 -t 00:36:25 cut.mp4